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EAF1 Regulates Vegetative-Phase Change and Flowering Time in Arabidopsis1

Derek B. Scott, Wei Jin, Heidi K. Ledford, Hou-Sung Jung, and Mary A. Honma*

Developmental, Cell, and Molecular Biology Group/Department of Botany, Duke University, Durham, North Carolina 27708-1000

We have identified a new locus that regulates vegetative phase change and flowering time in Arabidopsis. An early-flowering mutant, eaf1 (early flowering 1) was isolated and characterized. eaf1 plants flowered earlier than the wild type under either short-day or long-day conditions, and showed a reduction in the juvenile and adult vegetative phases. When grown under short-day conditions, eaf1 plants were slightly pale green and had elongated petioles, phenotypes that are observed in mutants altered in either phytochrome or the gibberellin (GA) response. eaf1 seed showed increased resistance to the GA biosynthesis inhibitor paclobutrazol, suggesting that GA metabolism and/or response had been altered. Comparison of eaf1 to other early-flowering mutants revealed that eaf1 shifts to the adult phase early and flowers early, similarly to the phyB (phytochrome B) and spy (spindly) mutants. eaf1 maps to chromosome 2, but defines a locus distinct from phyB, clf (curly leaf), and elf3 (early-flowering 3). These results demonstrate that eaf1 defines a new locus involved in an autonomous pathway and may affect GA regulation of flowering.

1   This work was supported by grants from the American Cancer Society (no. JFRA-607), the National Science Foundation (no. IBN-9509229), and the North Carolina Biotechnology Center (no. 9513 ARG-0039) to M.A.H.
*   Corresponding author; e-mail honma{at}acpub.duke.edu; fax 1-919-613-8177.

Plant Physiol. (1999) 120: 675-684
Copyright Clearance Center:   0032-0889/99/120//10
© 1999 American Society of Plant Physiologists




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